Welding machine



FIG. 1 is a perspective view of the top, front and right side of awelding machine showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a bottom view thereof.

The ornamental design for a welding machine, as shown and described.